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#1 |
24·317 Posts |
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last night my computer finished stage 1 p-1 factoring and did some sort of stage 1 GCD then went right on to L-L testing, my question is, was the stage 2 p-1 factoring already done on the exponent by another person before I got it to L-L test, and if so, why weren't any of the other factoring tests done?
hope someone can clear this up, Mr. 0.45% L-Ling of second exponent |
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#2 |
Jun 2004
UK
139 Posts |
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If you don't have enough memory allocated to prime95/mprime then it'll skip Stage 2. Trial factoring will likely have already been done much earlier by someone else.
Last fiddled with by marc on 2005-01-18 at 12:04 |
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#3 |
100101111001102 Posts |
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that's probably it, I had 8 MB (I think that's the default) allowed for Prime95, and I did the trial factoring on it myself before the Stage 1 P-1 factoring
so the Stage 2 on that exponent will never be done? just kinda answered that myself, if the L-L shows up not prime then it won't need to be done |
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#4 |
"Richard B. Woods"
Aug 2002
Wisconsin USA
170148 Posts |
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Mr. >0.45% L-Ling of second exponent,
Eventually someone will come along to use P-1 stages 1 & 2 with large bounds on your exponent in a follow-on effort to try to find a factor (this is a separate project from your searching for Mersenne primes), but don't worry about it. When your computer did the P-1, your copy of Prime95 chose the optimum bounds for maximizing its usefulness to GIMPS, taking into account your computer's CPU type, speed, and memory allocation. If you'd allocated more memory, Prime95 might have done stage 2 to look somewhat deeper for a factor, but the small advantage in factor-finding efficiency is definitely not big enough to justify redoing, or worrying about, it! |
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#5 |
22×2,081 Posts |
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ok, I'm glad that thing is cleared up about that
p.s. it will be a while till they find a factor for mine, huh? since they just found 971 exponent's factor according to www.mersenne.org |
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#6 | |
"Juan Tutors"
Mar 2004
24×5×7 Posts |
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